Attachment-conductor for electrical instruments.



G. J. SCHNEIDER.

ATTACHMENT CONDUCTOR FOR ELECTRICAL INSTRUMENTS.

APPLICATION FILED JAN. 16,1911.

Patented Dec. 1, 1914.

' ments, of which thev used in connection GEORGE \T. SCHNEIDER, 0F

DETROIT, MICHIGAN, ASSIGNQR 3H3 HEATER COKPANY, OF DETRGIT, MICHIGAN, .21. GORPURATIOZ'Q' OI" 32H!) ACME f ATTACHHENT-CONDUGTUR FOR ELECTRICAL Application filed Ianusw 16, 191.3

To (:52 whom it may concern:

Be it known that I, GEoRcE J. Sonuumrss, a citizen of the United States of America, residing at Detroit, in the county of l Vayne and State of Michi an, have invented certain new end usefu Improvements in Attachment-Conductors for Electrical Instrufollowing is e specification, reference being had therein to the accompanying drawings.

The invention relates to attachment con ductors for electrical instruments and con s'ists in the novel construction of means for protecting, and preventing twisting or kiuklng of the flexible conductor, and. further in the construction of the attacl mcnt plug as more -fully hereinafter set forth.

In the drawings, Figure l is an elevetion of the attachment conductor shown as with an electrically heated sad-iron; Fig. 2 is a sectional elevation of the plug; Fig. 3 is a similar View ofithe plug for the opposite end of the conductor; Fig. 4 is a perspective View of several parts composing the plug, detached.

It is usual in the construction of attachment conductors to provide a flexible cord having the conductors in separate strands braided or twisted together. Such constructions provide flexibility but in use it frequently occurs that the conductor becomes twisted or tangled so as to the freedom of movement of the instrument. This is electrically heated sad-irons.

It is one of the objects of the present invention to avoid this difficulty by providing means for resistin the twisting of the conductor, and also or automatically straightening the conductor when released, the construction being as follows:

A is an attachment plug suitable for connection with any standard construction of fixture, B is the fienible attachment conductor leading from this plug to the instrument is the attach of said COI1- the instriunent.

such as the sad-iron C, and D ment plug at the opposite end ductor for engagement with The body of the attachment conductor B is formed in any suitable inenner as by twisted strands E oi insulated flexible conducting Wire. Surrounding this is a metallic coil Speclficaticc. of Letters Eatcnt.

interfere with particularly true in the case of Paten ed lit 1 fierial No. 8%,2'379.

or helix F which forms both protecting the insulated conductors c, by its resiliency resists the kinking mg the cord. lhis helix extends tire length of the cord ends is attached to the plugs A and D. connection between each end or the cord 5' id its respective plug preventing relati": c rotary movement between the cord and the plugj 5 Thcattachment plug D is preferably of the construction shown in detail in Fi s 2 the LII

."1. the enund at its opposite and comprising an armor, and insul d bl contact terminals insertible into a socket in the electrical iustriunent. hc co ternzinals G and G are form l of pa resilient metallic strips electrically re edges v of said insulator slotted at H to permit of engagement with the cooperating contact members l /l, M. These cooperating; members are arranged in aluienient with each other but are sepsra'ied by an air gap for insulation, and as sufiicicnt width to permitthe insertion of thedivision wall H therehetrvecu.

For attaching the helix F to the plug D blocks 5 ere provided with ennui grooves P which engage an enlarged coil at the end of the helix and prevent it from heing Withdrawn. Thus in use Whenever the instrument is turned or twisted it will place the helix F under tension and the instant that the cord isreieased the reaction of the helix will a in straighten it. If therefore, the cor becomes twisted by the turning of the instrument it is only necessary pin out the attachment plug l3" and the helix will then cause the autouistic un ing. The helix F is also suseful cs e c M J. v

wqgsczing h e imaglationof tha card. from pigxg t plug ma; non mfimfiiwly Msfimhac? $0 M) ma 9: miner mgury. 5 1d plugs. 1'. his A. cialm'as'my infiemlon 1s: In testlmon whm'eof Iafix my signature amchmeiit conductorfi for electrics? ind in presence two Witnesses. J 2 11-21129 wmprising a exible insu am -1 rluctm, csntacing plugs at opposite ends G' P 151 wniuctornsn-rot'atively attached. Witnesses:

anal a, r'eslhenia hehx surroundun W. J. BELKNAP, J 1;

t'mauci-az amending conizmuously from JAMES P. BARRY. 

